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arXiv 1306.6296cond-mat.mes-hall
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纳米带中自旋极化电流产生的周期性磁结构

Periodic magnetic structures generated by spin-polarized currents in nanostripes

Oleksii M. Volkov, Volodymyr P. Kravchuk, Denis D. Sheka, Franz G. Mertens, Yuri Gaididei

摘要:

数值研究了自旋极化电流对长铁磁纳米条纹的影响。电流垂直于条纹流动。该研究是基于朗道Lifshitz唯象方程与Slonczewski-Berger自旋力矩项。的磁化行为进行了分析的所有范围内的应用电流,饱和。结果表明,饱和电流是条宽的非单调函数。当条纹宽度增加时,它接近无限薄膜的饱和值。在饱和以下观察到一些稳定的周期性磁化结构。周期性结构的类型取决于条纹宽度。除了一维的域结构,典型的窄线,和二维的涡旋-反涡旋晶格,典型的宽膜,观察到一些中间结构,例如交叉结和金刚石状态。对于窄条纹,提供了分析。

英文摘要:

The influence of a spin-polarized current on long ferromagnetic nanostripes is studied numerically. The current flows perpendicularly to the stripe. The study is based on the Landau-Lifshitz phenomenological equation with the Slonczewski-Berger spin-torque term. The magnetization behavior is analyzed for all range of the applied currents, up to the saturation. It is shown that the saturation current is a nonmonotonic function of the stripe width. For a stripe width increasing it approaches the saturation value for an infinite film. A number of stable periodic magnetization structures are observed below the saturation. Type of the periodical structure depends on the stripe width. Besides the one-dimensional domain structure, typical for narrow wires, and the two-dimensional vortex-antivortex lattice, typical for wide films, a number of intermediate structures are observed, e.g. cross-tie and diamond state. For narrow stripes an analytical analysis is provided.

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